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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> NPDES NO. CA0084255 <br /> WASTE DISCHARGE REQUIREMENTS ORDER NO. 98-062 <br /> FOR <br /> SETTLING DRY CLEANING DEFENDANTS <br /> LINCOLN VILLAGE CENTER <br /> GROUNDWATER TREATMENT SYSTEM <br /> SAN JOAQUIN COUNTY <br /> The California Regional Water Quality Control Board, Central Valley Region, (hereafter Board)finds that: <br /> 1. The Settling Dry Cleaning Defendants, as defined by Consent Decree No. CIV-S-91 760 DFL <br /> (GGH) filed 18 January 1996 with the U.S. District Court, and listed in Attachment A (attached <br /> hereto and made a part of this Order by reference), submitted a Report of Waste Discharge, dated <br /> 21 March 1997, and additional information dated 2 May 1997, for a permit to discharge waste <br /> under the National Pollutant Discharge Elimination System (NPDES). The Settling Dry Cleaning <br /> Defendants are hereafter Discharger. <br /> 2. The Discharger proposes to discharge waste from a groundwater treatment system designed to <br /> remove volatile organic compounds (VOCs) from groundwater and investigation derived residual <br /> fluids collected during ongoing investigation, remediation, and monitoring activities. Treated <br /> groundwater will be discharged into a storm drain in San Joaquin County which is tributary to <br /> Fourteen Mile Slough and the San Joaquin River, a water of the United States, at a point defined as <br /> latitude 37°59'58", longitude 121°20'38", as shown on Attachment B, which is attached hereto and <br /> made part of this Order by reference. The discharge of treated water into the storm drain may also <br /> result in incidental leakage of the treated water from cracks or joints in the storm drain to underlying <br /> soils and ground water. The extracted ground water will be treated to comply with the effluent <br /> limitations contained in this Order. <br /> 3. Pumped groundwater will be treated by air stripping and granular activated carbon. The activated <br /> carbon will be regenerated or disposed of off-site. The proposed treatment system is designed for a <br /> flow of 300 gpm (430,000 gpd) of extracted groundwater, and is proposed to be operated at a flow <br /> of approximately 200 gpm (290,000 gpd). <br /> 4. Tetrachloroethylene (PCE), trichloroethylene (TCE), cis-l,2-dichloroethylene (DCE), methylene <br /> chloride, and 1,2-dichloroethane (1,2-DCA) have been identified in the groundwater as constituents <br /> of concern. In addition, it is suspected that the constituents benzene,toluene, xylene, and ethylbenzene <br /> (BTEC, lead, and also methyl tertiary-butyl ether(MTBE) or other oxygenate compounds may <br /> become present in water pumped from extraction wells due to two fuel contamination sites which <br /> are also present at the Lincoln Center. The proposed treatment plant is expected to treat the volatile <br /> organic compounds to non-detectable levels. It is currently unknown if the treatment plant will <br /> effectively remove oxygenate compounds. This Order requires a treatment performance evaluation <br />